(P17)	(Q884)
(P31)	(Q134161) (P143)
(P159)	(Q8684) (P143) (P4656) https://ko.wikipedia.org/w/index.php?title=서울9호선운영&oldid=26634297
(P571)	Thursday, June 28, 2007 (P143) (P4656) https://ko.wikipedia.org/w/index.php?title=서울9호선운영&oldid=24555116
(P856)	http://www.metro9.co.kr (P143) (P4656) https://ko.wikipedia.org/w/index.php?title=서울9호선운영&oldid=24555116
(P1454)	(Q134161)

External Links

(P2671)

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